The bash (Bourne-Again SHell) is a sh-compatible command-line interpreter that reads from standard input or from a file and gives you the resulting output. We have already written an article about bash and its differences from the standard POSIX shell. Today, you will learn how
Before understanding what is Bash shell, you must be familiar with the concepts of a command-line interpreter and Linux Shell (or sh). What is a Command-Line Interpreter? The term “command-line interpreter” refers to a program or text-based interface that sits between the user and the
In Linux, you might already be navigating through different directories without knowing whether an absolute or relative path is being used. It becomes important for you to understand them when you are working with scripts, navigating through different user or root directories, or creating symbolic
The GUI text editor gives you a separate panel in the footer to inform you of the number of words, lines, and characters in your text file. Even though you can easily find the number of strings that occurred in your text file using this
The WC command is used to count various parameters from the specified file, like the number of lines, word counts, byte counts, character counts, and many more. Tutorial Details Description WC (Word Count) Difficulty Level Low Root or Sudo Privileges No OS Compatibility Ubuntu, Manjaro,
The eval command is used to execute specified arguments as a single command in the current command-line processing and return its result. It will combine (or construct) the arguments into a single string and use it as input to the shell, which will execute the
In Linux, the alias command is used to create shortcuts for long commands that have the same functionality as if you were writing the whole command. This way, you can improve your productivity and save time by creating a few aliases for the long or
Do you still type the long “sudo apt update && sudo apt upgrade -y” commands each time you want to update your Debian-based system? Or are you still navigating into directories (ex: “/var/www/html“) using the cd command each time you have to modify something there?
In Linux, whenever you want to execute any executable program or script, you need to jump into the directory and execute your program or script. But when you execute system commands like ls, pwd, echo, apt, and nano, you don’t need to jump into any
The source is a built-in command-line tool that reads and executes the commands from the specified file (in order) as its argument in the current shell. Each command from the specified file will be delivered to the TCL interpreter to be read and run, making
The env command is an advanced version of printenv with a few more features to tweak your environment variables, like setting new environment variables, printing all environment variables, or executing a command or script in a modified environment. I would also suggest you read the
The printenv command is an alternative to the env command used to fetch the value of a specified variable name (key) used as an argument. If no variable name is assigned to printenv, it will print all environment variables in your system. Tutorial Details Description
